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Arq vs Kopia: catalog facts
Arq	Kopia
Paid Paid software with a 30-day free trial.	Free Free and open source, with no paid edition.
Windows, macOS	Windows, macOS, Linux, Command line
Back up to your own cloud storage or local disk End-to-end encryption	A desktop app and a command line tool that share the same repository format End-to-end encryption with keys you control, plus compression and deduplication
No Linux version Cloud storage is billed separately by your provider	Backs up the files and folders you choose; it is not a whole-disk imaging tool Still pre-1.0, so repository format changes between versions are possible
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: Apache-2.0
Not stated if an account is needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 20, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.